
	Where results make sense

Topic: Spot beam

Related Topics

balance beam

tractor beam

beam splitter

Gymnastics balance beam

Gaussian beam

beam diameter

Electron beam tomography

Gravitational Beam Emitter

beam divergence

spot beam

Abraham D Beame

radio beam

In the News (Tue 15 Dec 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	[No title]
		Beam divergence is often stated as a critical parameter for laser performance.
		Thus, beam divergence is usually stated as diffraction limited or as a multiple of the diffraction limit.
		The common measurement method used to characterize a laser beam divergence is to convert the beam to the far field and to measure the far field spot size.
	www.stanford.edu /~fehr/class/lasers/olddat/files/2_Exp2a.doc (2332 words)

	1936 - New Motion Picture Apparatus - SMPTE
		With a beam divergence of 8 degrees in the spot lamp illustrated, it is possible to effect such a collection of direct and reflected light upon the condenser lens of only 32 degrees.
		For the conditions under which spot lamps are used, it is desirable that the beam have its highest intensity at the center and that the edges be soft so as to permit overlapping the beams of several such lamps without building up high intensities in the areas overlapped.
		The fact that the projected spot at all times has soft diffusing edges permitting areas to be overlapped without showing rings or bands of lights, especially adapts it to back-lighting; and the wide range of intensity within the various beams is particularly advantageous for such purposes.
	www.mole.com /aboutus/history/smpte/1936-01p95.html (2275 words)

	Fully interconnected spot beam satellite communication system - Patent 4813036
		In a spot beam satellite system, either one transponder or a group of transponders operate in conjunction with receive and transmit antenna beams that have a coverage area that is geographically distinct from the coverage areas of other receive and transmit antenna beams operating with other transponders or groups of transponders.
		"Beam" is used to refer to a spot beam covering a portion of the total satellite coverage area or to a larger beam covering the same area as a number of spot beams up to and including the entire coverage area of the satellite.
		The signals received from spot beam areas A and B on uplink antennas 70 and 71 are processed through receiver and frequency translator 72, the output of which is connected in parallel to fractional filters G.sub.1a through G.sub.4a.
	www.freepatentsonline.com /4813036.html (5118 words)

	Sensors Magazine Online - May 1998 - The Basics of Triangulation Sensors (Site not responding. Last check: 2007-10-20)
		Where the beam diameter is larger than or the same size as the feature, the sensor has sufficient resolution; where the feature is smaller than the beam diameter, the resolution is inadequate for feature detection and measurement.
		Spot diameter is usually specified in the center of the working range, but the limitations of physical optics dictate that it will not remain that size throughout the working range.
		One disadvantage of PSDs is that the centroid of the spot is determined by the detector.
	www.sensorsmag.com /articles/0598/tri0598/main.shtml (2251 words)

	United States Patent Application: 0040092227
		Spot beam technology also permits reduction of ground terminal size to a point where such terminals become commercially feasible as a mass-market end-user terminal.
		High-gain uplink spot beams are preferably utilized to support small low-power, low cost, end-user earth station terminals 16, while high-gain downlink spot beams are utilized to support high-data-rate transmission to the same small end-user terminals 16.
		Spot beams on the broadcast polarization will be received at the satellite by a plurality of receiver subsystems 202 having a bandwidth equal to the full primary spectrum.
	appft1.uspto.gov /netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=/netahtml/PTO/srchnum.html&r=1&f=G&l=50&s1="20040092227".PGNR.&OS=DN/20040092227&RS=DN/20040092227 (2523 words)

	Melles Griot Optics Guide - Transformation and Magnification by Simple Lenses (Site not responding. Last check: 2007-10-20)
		For Gaussian beams, Self has derived an analogous formula by assuming that the waist of the input beam represents the object, and the waist of the output beam represents the image.
		Since the depth of focus is proportional to the square of focal spot size, and focal spot size is directly related to f-number, the depth of focus is proportional to the square of the f-number of the focusing system.
		The intensity profile of the spot is strongly dependent on the intensity profile of the radiation filling the entrance pupil of the lens.
	www.mellesgriot.com /products/optics/gb_2_3.htm (1533 words)

	World Intellectual Property Organization (Site not responding. Last check: 2007-10-20)
		The absolute size of the beam spot may be related to the overall size (in particular the focal length of focussing lenses) of the active elements of the instrument.
		A particle beam generator as claimed in Claim 9 wherein the collimating means comprises a conical integrally formed in the wall of the accelerating means, the conical having a diameter increases in the direction of the accelerated beam.
		A particle beam generator as claimed in Claims 9 and 10, wherein the collimating means comprises at least one aperture having a lesser diameter relative to the accelerating aperture and is disposed on the longitudinal axis thereof.
	www.wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=03/107375.031224&ELEMENT_SET=DECL (6633 words)

	yet2.com - TechPak
		The laser spot is automatically kept well centered at different spot sizes and the technology uses a minimal number of optical components.
		The laser spot size must accordingly be adjusted to the resolution wanted. This can be done by sending the beam through a smaller aperture, but then the energy available at the imaging surface is reduced. Another way would be to use a zoom lens, but this lens type is complex and expensive.
		Positioning of these lenses along the optical axis, determines the spot size obtained in the image plane. A sensor detects the position of the beam spot on the image surface before and after a change of spot size.
	www.yet2.com /app/list/techpak?id=24753&sid=90&abc=0&page=tpprint (745 words)

	Bausch & Lomb: Laser Surgery Story/The history of laser surgery (Site not responding. Last check: 2007-10-20)
		First- and second-generation excimer lasers use a broad beam (about 6 mm in diameter) with an aperture that controls the amount of the beam that is exposed to the eye during any single pulse.
		Manufacturers have refined this technology by splitting the single broad beam into several smaller beams that are rotated around the treatment area (similar to how a showerhead splits the main water stream into smaller streams).
		Unlike the broad beam, the full width of the flying spot beam is exposed to the cornea during every pulse.
	www.bausch.com /us/vision/concerns/surgery/history.jsp (853 words)

	Polarimeter Scans--Take 1 (Site not responding. Last check: 2007-10-20)
		I made the beam spot smaller for this study so that the change in vertical position would be roughly equal to one beam diameter.
		More important, it looks like the beam spot in the polarimeter line is significantly larger and more oval-shaped than the spot in the main line.
		One conclusion I think I can draw is that the peak-to-peak variations in polarization measured by each scan seem roughly consistent: 12.4nm of phase shift for the polarization scan and 11nm for the asymmetry scan, which was less complete.
	www.jlab.org /~humensky/Files/Polarimeter_Scans--Take_1.html (534 words)

	Woodalls Open Roads Forum: Technology Corner: DirecTV spot beam question
		The question may not be whether the area is served by a spot beam, but whether it is served by the same spot beam you receive at home.
		If your locals are on a spot beam, and you move out of the area served by that particular spot beam, you won't be able to receive your locals.
		Some of these spot beams are located at 101, but most of the recent additions have gone on at 119.
	www.woodalls.com /cforum/index.cfm/fuseaction/thread/tid/909564.cfm (795 words)

	Multi-size spot beam imaging system and method (EP0877273A2) (Site not responding. Last check: 2007-10-20)
		A system for forming optical beam spots of different sizes on an imaging surface (245), includes an emitter (205) configured to emit an optical beam along a path.
		The optical beam is focused at a first focus point (255) and impinges upon the imaging surface downstream of the first focus point.
		With the lens at the first position the optical beam forms a beam spot of a first size on the imaging surface and with the lens at the second position the optical beam forms a beam spot of a second size, which is different than the first beam size, on the imaging surface.
	www.delphion.com /details?pn10=EP00877273 (227 words)

	SurfWax: News, Reviews and Articles On Spot Beam
		MPDS connectivity is available within Inmarsat's spot beam coverage area and users pay only for the amount of data sent and received, rather than the amount of time they are connected...
		Spot beam satellites are designed primarily for broadband data/Internet applications and therefore can generally support more customers than traditional satellites...
		The increased efficiency of spot beam satellites is expected to reduce the cost of satellite airtime and...
	telecom.surfwax.com /files/Spot_Beam.html (1034 words)

	Fresnel Lighting Fixtures from Alpha Sound & Lighting Co. (Site not responding. Last check: 2007-10-20)
		(1) Beam Angle is determined as a spread where the beam edge intensity is equal to 50% of the center beam intensity.
		(2) Field Angle is determined as a spread where the beam edge intensity is equal to 10% of the center beam intensity.
		As an example: the Spot Beam Angle of the 61-06X at 60 feet = (3.6' dia)60 ÷ 30 = 7.2 dia.
	www.alphasoundandlighting.com /fresnels.html (340 words)

	Dama type satellite communication system using non-overlapped multi-spot beam - Patent 5737684
		This conventional satellite communication system corresponds to the single beam system such that all of the satellite earth stations 150.sub.1 to 150.sub.3 are covered by a single satellite.
		In this case, which the multi-spot beam is utilized as the cross beam, and operates in a non-overlapping beam topology, and has a feature that satellite communication between one zone and another zone is allowable, but return communication via satellite in the same zone is prohibited.
		5, a single antenna beam may cover one of zone X where the control station 10 and the satellite earth station 20.sub.1 are located, and zone Y where the satellite earth stations 20.sub.2 and 20.sub.3, and the repeater station 30 are located.
	www.freepatentsonline.com /5737684.html (6453 words)

	First DIRECTV Spot Beam Satellite Shipped for Late November Launch
		EL SEGUNDO, CA November 7, 2001- DIRECTV, Inc., a unit of Hughes Electronics Corporation, and Boeing Satellite Systems announced today that DIRECTV-4S, a new high-power spot beam satellite, has been shipped to the Guiana Space Center in Kourou, French Guiana and is scheduled for launch on Nov. 26.
		A Boeing 601HP, DIRECTV-4S is the first spacecraft in the DIRECTV fleet to use highly focused spot beam technology that will provide DIRECTV with the capacity to deliver more than 300 additional local channels to its 41 local channel markets.
		The 5,733-pound satellite will carry a spot beam payload of 38 active transponders, two active national transponders and eight supplemental national transponders.
	www.boeing.com /news/releases/2001/q4/nr_011107s.html (585 words)

	Measuring the Beam Spot Size on Target (Site not responding. Last check: 2007-10-20)
		Note: The beam must be on (> 1 uA) for some time in the first few thousand events.
		A few common sense tips about raster and spot size: Do not confuse the "rastered spot size" (of order 4 mm) with the "intrinsic spot size" (typically 10 times smaller).
		If your purpose is to check the spot size and dwell time to avoid destroying the target, then test at low current, say 1 microamp, before going to high current on target.
	hallaweb.jlab.org /equipment/daq/spot.html (234 words)

	A Real Spot Beam Map! - DealDatabase Forum - Deals, Freebies, and TiVo & DirecTivo Hacking
		Looking at the spot beam map, I should at least be able to get a few more areas.
		spot beam doesn't necessarily mean we get everything in the same spot as ourselves.
		Normal beams broadcast a very wide footprint (in fact it is posible to get DTV sats in South America).
	www.dealdatabase.com /forum/showthread.php?s=&threadid=8727 (1302 words)

	DIRECTV Spots Beam Transponders.... - DBSTV Forum (Site not responding. Last check: 2007-10-20)
		We do not publish the spot information, but most installers can figure out which spot they are receiving their locals from just by looking at the power levels of those six transponders.
		The spot beam transponder can be up to 7dB hotter than a conus transponder, if you are in the center of the spot, dropping off quickly near the edge.
		Another trick that you might try is repointing the dish a little to lower the power on the spot beam, since it is coming from a different spacecraft.
	dbstvforum.com /ubb/Forum2/HTML/000073.html (227 words)

	Sam's Laser FAQ - Items of Interest
		The angle of beam incidence is also fairly critica and should be as close to normal as possible without reflections off the sensor hitting the laser output mirror and bouncing back into the sensor.
		The laser beam heats the mass resulting in a movement of the pointer of 1 division for each 10 J of beam energy.
		Send the laser beam through a pair of 45 degree plain glass beam splitters (e.g., microscope slides) in series with the reflected beam from beam splitter 1 going to beam splitter 2 and sending only the reflected beam from beam splitter 2 to your laser power meter's sensor.
	repairfaq.ece.drexel.edu /sam/laserioi.htm (19806 words)

	ECHOSTAR BUYS TWO SPOT BEAM DBS SATELLITES, ONE Ka/Ku BIRD
		They will each be capable of operating 32 DBS transponders at 120 watts each, switchable to 16 transponders operating at 240 watts each.
		The spot beam payloads for each satellite have been designed to work together to maximize the number of local spot markets served across the United States, while providing mutual back up to offer increased reliability to customers.
		EchoStar 7, is based on the Lockheed Martin A2100 AX satellite bus.
	www.spaceandtech.com /digest/sd2000-01-005.shtml (348 words)

	Will satellites ever go to spot beam only? - AVS Forum (Site not responding. Last check: 2007-10-20)
		Doing that amount of spot beams on one bird would be hard to isolate same frequency antenni.
		With the spot beam, on a given frequency, they can broadcast one channel in one area of the country, while on the same frequency, broadcast a different channel in another area.
		After thinking about this for a while, I suspect that there will always be a couple of national feeds for the networks, and a mobile viewer may have to pay for a separate programming package for his motorhome, as opposed to his home system.
	www.avsforum.com /avs-vb/showthread.php?goto=newpost&t=573019 (980 words)

	TiVo Community Forums Archives - Spot Beam Question--Newbie (Site not responding. Last check: 2007-10-20)
		That means that when they were beaming out the signal for the local channels in Florida, it was carried in the same signal that reached the people in San Diego.
		Now, the new "spot beam" works like a bunch of flashlights being shined onto different areas of the country.
		Since each beam does not carry channels people aren't supposed to be seeing, this allows them more room to squeeze in more local channels (which they had to do because of a "must carry" law which forced them into showing all qualified local channels in a market if they wanted to carry any).
	archive.tivocommunity.com /tivo-vb/history/topic/37882-1.html (1338 words)

	System for demonstrating arbitrary multi-spot beam steering from spatial light modulators (Site not responding. Last check: 2007-10-20)
		A graphical user interface is used to program sequences of analog phase patterns onto a 512 x 512 pixel, electrically-addressed spatial light modulator (SLM).
		Hand sketches made with a digital pen are used to prescribe the footprints, velocities and trajectories of multiple, independently-controlled diffracted spots.
		The interface is intended to demonstrate to potential end-users, who are not knowledgeable about diffractive optical design, to what degree SLM’s may be considered to produce arbitrary multi-spot beam steering.
	www.louisville.edu /~x0chan01/pub/opexp2004.htm (139 words)

	LADARVision.com: Excimer laser information including features and benefits at LADARVision.com (Site not responding. Last check: 2007-10-20)
		The smaller and more precise the laser beam, the more precisely your surgeon can reshape your eye's cornea.
		The beams of light they produce can vary considerably, both in their shape, size, and nature.
		When used with the LADARVision® system's eye tracking device and LADARWave® wavefront device, the excimer laser beam allows the surgeon to place laser pulses precisely where they are needed, providing you with a completely customized LASIK procedure, called CustomCornea®.
	www.ladarvision.com /ladarvision/excimer-laser.asp (383 words)

	TiVo Community - DirecTV 7S channel map, transponder map, and spot-beam map (Site not responding. Last check: 2007-10-20)
		The tp 31 spot beam is obviously reaching all 3 dma's.
		Monterey is also using tp23 for most of its locals, same as SLO, so it appears that the 23 spot beam covers a good portion of the coast extending as far north as San Francisco and possibly south of Ventura.
		I would imagine that you could see the Bakersfield DMA spot beam which I'm guessing is on 25 or 29.
	www.tivocommunity.com /tivo-vb/archive/index.php/t-181635.html (2867 words)

Try your search on: Qwika (all wikis)